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Last Updated: Oct 23, 2018

Private zone

  • Private zone: A private zone file contains the resource records of domain or subdomain names that you need to manage. It is a tool that most DNS software uses to manage domain namespace.

In PrivateZone, you can add more than one domain or subdomain. Resource records in the subdomains override resource records in the domains.

  • Hostname: The prefix of a subdomain name is a hostname, such as www. @ is used as the hostname of a root domain.

  • Record type: The record types supported by PrivateZone is shown in the following table.

Type Description
A Points the domain name to an IPv4 address.
AAAA Points the domain name to an IPv6 address.
CNAME Points the domain name to another domain name, namely canonical name.
MX A mail server record that identifies the mail server for the domain name
TXT A TXT record contains one or more strings, with each enclosed in double quotation marks (“).
PTR Maps an IP address to the domain name.
  • TTL: the Time-to-Live of the record, in seconds, that the recursive DNS servers cache the records. For example, if the TTL is 60, the recursive DNS servers cache the domain name resolution result (the record) for 60 seconds. DNS queries within 60 seconds will be responded with the record cached.

Associate a private zone with VPCs

  • **VPC: For more information about VPC, see What is VPC?.

  • Associate a private zone with VPCs: You can associate a private zone with one or more VPCs. Private zones with the same name cannot be associated with the same VPC. For example, if two private zones are both named example.com, the private zones cannot be associated with the same VPC. Otherwise, when a DNS query is processed, the DNS server cannot determine the resolution result.

A single private zone can be associated with a maximum of 32 VPCs.

  • Disassociate a private zone from VPCs: You can disassociate a private zone from one or multiple VPCs.

Reverse lookup

  • Reverse lookup: Maps an IP address to a domain name. A reverse lookup returns the domain names of an IP address based on the PTR record.

  • Reverse lookup zone: The portion of the DNS namespace used for reverse lookup.This portion is called in-addr.arpa domain. For example, the zone 168.192.in-addr.arpa contains the reverse lookup results for IP addresses that start with 192.168.

  • PTR record: PTR records are DNS resource records that map an IP address to a domain name.